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- W2358200321 abstract "There were many studies on the climate and its effect on the grassland biomass of typical steppe in the Northern China,which showed that the biomass fluctuate seasonably with precipitation change.On long-time observation the grassland ecosystem could maintain the relatively stable biomass,thus it is imperative to study the mechanism of the stability of the grassland biomass.Here we present the results of a long-term(1981～2004) study of the natural steppe communities in the Northern China grassland.The seasonable fluctuation of the community biomass is not as sharp as precipitation change.It implies that the community biomass maintains a relative stability.It is assumed that if an ecosystem in a changing environment has compensatory mechanism,at least some of its components would show negative correlations in biomass over time.At the species level,correlation analyses for 77 species showed that a negative correlation existed for 31 species(compensation information).Importantly,the negative correlation existed between dominant and sub-dominant species,between dominant and non-dominant species,and between non-dominant and non-dominant species in the Leymus chinensis and Stipa grandis grassland.This indicates that a species will be increased in its abundance in response to the reduction of others in a fluctuating environment,it called compensatory effects.In addition,the negative correlation exists between perennial plant and perennial plant,between perennial plant and semi-shrubs or shrubs,while it was less between annual plant and perennial plant,between annual plant and semi-shrubs or shrubs.From the above analysis,we could see that compensation came mostly from those stable components in the grassland community.The most negative correlation existed Xerophytes and midxerophytes which were the master components of the grassland community because the rainfall was not more than that in the semiarid region.The compensatory effects occurred between the gramineous plants and another plants(added to 19 times),most of which were dominant species in the grassland community.In a word,although the community production fluctuated seasonably in the Leymus chinensis and Stipa grandis grassland,the ecosystem could maintain relative stability in a long term for compensatory effects between species and species as well as between species and functional group.Therefore,the study would redound to the advanced research in the stable mechanism of the grassland ecosystem not only in the productivity of the ecosystem." @default.
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- W2358200321 date "2007-01-01" @default.
- W2358200321 modified "2023-09-24" @default.
- W2358200321 title "Stability and Compensation of the Aboveground Biomass in the Leymus Chinensis and Stipa Grandis Grassland of Inner Mongolia" @default.
- W2358200321 hasPublicationYear "2007" @default.
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